chore: update vaadin 25.0.0-beta8

[ZheSun88]

No description provided.

[github-actions]

AI Language Review

The main change across the files appears to be the swapping of javax.annotation.Nonnull with jakarta.annotation.Nonnull. There do not seem to be any errors or issues with this change, as long as the environment is configured to handle jakarta.annotation correctly. Therefore, I have no suggestions or required improvements to note.

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[sissbruecker]

You may be already aware, but starting the docs in dev mode results in this:

Caused by: java.lang.RuntimeException: DevModeHandlerManager not found, but dev server is enabled. Either disable by setting vaadin.frontend.hotdeploy=false (and run the build-frontend maven goal) or add 'com.vaadin.vaadin-dev-server' dependency or include it transitively via 'com.vaadin.vaadin-dev'.
        at com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener.failFastContextInitialized(VaadinServletContextInitializer.java:528) ~[vaadin-spring-25.0.0-beta7.jar:na]
        at com.vaadin.flow.spring.VaadinServletContextInitializer$FailFastServletContextListener.contextInitialized(VaadinServletContextInitializer.java:202) ~[vaadin-spring-25.0.0-beta7.jar:na]
        ... 44 common frames omitted

[ZheSun88]

oh. let us add the vaadin-dev dependency, it has been removed from vaadin-spring-boot-starter in this beta7 release.

also i have updated the project to beta8.

[sissbruecker]

vaadin-dev should be optional I think, otherwise you pull it into the production build. This is what a v25 starter has:

        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-dev</artifactId>
            <optional>true</optional>
        </dependency>